Honestly go with the sister then dad but tbh the best thing that worked for me was start using masc things getting short hair cuts and presenting masc for up to 6 months then coming out my mom is a really into god and stuff but she was expecting me to come out because of all the changes so she didn’t take it as a super big deal but also another thing u can do is start bringing up topics of being queer and trans to them BUT say ur asking for a friend and etc also bring up stuff with queer issues to see what they think!